US4830466A - Drive system for an active matrix liquid crystal display panel having divided row electrodes - Google Patents
Drive system for an active matrix liquid crystal display panel having divided row electrodes Download PDFInfo
- Publication number
- US4830466A US4830466A US06/839,196 US83919686A US4830466A US 4830466 A US4830466 A US 4830466A US 83919686 A US83919686 A US 83919686A US 4830466 A US4830466 A US 4830466A
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- US
- United States
- Prior art keywords
- display panel
- liquid crystal
- row electrodes
- horizontal scanning
- crystal display
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
- G09G3/3666—Control of matrices with row and column drivers using an active matrix with the matrix divided into sections
Definitions
- the present invention relates to an active matrix liquid crystal display panel, and more specifically to a drive system for an active matrix liquid crystal display panel in which an address switching transistor is connected to each of the picture elements for a matrix display pattern.
- a thin film transistor (TFT) active matrix liquid crystal display device is known as a typical matrix liquid crystal display device involving nonlinear elements for driving the liquid crystal.
- This conventional display device incorporates address TFT's arranged in a matrix in the liquid crystal display panel, whereby the display device provides the same high contrast display as achieved by static drive even if it employs multiplex drive with a small duty ratio, i.e. with multiple lines.
- the drive system of the TFT active matrix liquid crystal display device may have the circuit construction shown in FIGS. 1 and 3 and signal waveforms shown in FIG. 2.
- a TFT 11c is connected to a liquid crystal display panel 11 at the intersection between a row electrode 11a and a column electrode 11b.
- a liquid crystal layer capacity is designated by 11d.
- a row electrode drive 12 is mainly composed of a shift register which shifts and outputs scanning pulses S sequentially to corresponding row electrodes by clocks ⁇ sent from a gate signal control 13.
- a pulse voltage whose pulse width is equal to the scanning period H is applied to the row electrodes sequentially, thus turning ON the TFT's.
- a column electrode driver 14 comprises a shiaft register 16, sampling switches, etc. as shown in FIG. 3.
- the column electrode driver 14 samples data signals transmitted in series from a data signal control 15 and outputs them sequentially to the column electrodes in synchronization with clocks ⁇ with timings corresponding to the respective column electrodes, so that the data signals are written in the liquid crystal layer through the TFT's 11c.
- This drive system which sample-holds (SH) data signals directly in the display panel, is called a panel SH drive system.
- the period for writing data in the liquid crystal layer therefore, ranges from 1H or 63.5 ⁇ s (one horizontal scanning period) to 11 ⁇ s (horizontal retrace period) for a television signal, for instance. Accordingly, the period allowed for writing data in the liquid crystal layer of display picture elements decreases at later sampling timing; the shortest write period is 11 ⁇ s.
- the data signal applied for each scanning line reverses its polarity.
- the liquid crystal write period becomes shorter at a later data sampling timing.
- T ON which is the product of TFT ON resistance (R ON ) and liquid crystal layer capacity (C LC )
- the write period is sufficiently long at an earlier sampling timing, so that the liquid crystal layer can be charged through the TFT's with voltage applied to the column electrodes to a specified potential, but the write period decreases at a later sampling timing until the TFT's are finally turned OFF before the liquid crystal has been charged to the specified potential.
- the old data cannot be rewritten completely.
- the potential applied to the liquid crystal layer is of in-between of the potentials of the old data and the new data. Consequently, data mixed with the old data is displayed on the panel.
- a difference in the write period among the display picture elements in the lateral direction of the display panel may result in a display picture of various definition.
- the object of the present invention to provide a liquid crystal display panel drive system which permits the liquid crystal layer to be charged to a higher potential and minimize or eliminate any difference in the data write period among the picture elements along the lateral direction of the display panel.
- the active matrix liquid crystal display panel drive system of the present invention in which data is sample-held directly in the display panel, is characterized in that row electrodes connected with address switching transistor gates are divided into two portions at the approximate center of the display panel, so that laterally elongated row electrodes extend from both ends to the approximate center of the display panel, and that one horizontal scanning is conducted for each pair of laterally adjacent row electrodes.
- the period for writing data signals in the liquid crystal layer can be increased to permit a higher potential charge for the liquid crystal layer, and the difference in write period is minimized among the display picture elements along the lateral direction of the display panel, thus enhancing the display definition. Furthermore, according to the present invention, it is possible to turn ON the switching transistors synchronously with a display picture element having the shortest write period so that the write period is uniform. As a result, the difference in write period among the picture elements in the lateral direction of the display panel is eliminated, thus improving display definition.
- FIG. 1 is a schematic block diagram of a conventional liquid crystal display device
- FIG. 2 is a timing chart showing various signals occurring within the conventional liquid crystal display device of FIG. 1;
- FIG. 3 is a block diagram of an essential part of the conventional liquid crystal display device of FIG. 1;
- FIG. 4 is a schematic plan view of an embodiment of a liquid crystal display panel of the present invention.
- FIG. 5 is a timing chart showing gate signals occurring within an embodiment of a liquid crystal display device of the present invention.
- FIG. 6 is a detailed timing chart of the gate signals of FIG. 5;
- FIG. 7 is a timing chart showing gate signals occurring within another embodiment of a liquid crystal display device of the present invention.
- FIG. 8 is a detailed timing chart of the gate signals of FIG. 7.
- FIG. 4 shows the structure of the row electrodes of a liquid crystal display panel.
- the laterally elongated row electrodes are divided into two portions at the approximate center of the display panel 1, so that the row electrodes 1a and 1b extend in pairs from both lateral ends toward the approximate center of the display panel 1.
- the left side row electrodes 1a constitute odd number row electrodes e 1 , e 3 , . . . , and e m-1
- the right side row electrodes 1b constitute even number row electrodes e 2 , e 4 , . . . , and e m .
- row electrode e 1 provides a display for the former half of the horizontal scanning operation (1H), and the row electrode e 2 provides a display for the latter half.
- FIGS. 5 and 6 show waveforms of switching transistor gate signals applied from a row electrode driver (not shown) to the row electrodes e 1 , e 2 , . . . , and e m .
- the gate signals have a pulse width of 1H period (63.5 ⁇ s).
- the gate signal for an odd number row electrode 1a is synchronized with a falling edge of the horizontal synchronization signal, whereas the gate signal for an even number row electrode 1b is synchronized with the center of a low level period A of the horizontal synchronization signal.
- the pulses applied to the laterally adjacent row electrodes 1a and 1b are different in phase by about 1/2 the horizontal scanning period.
- a data signal is sampled by a column electrode driver (not shown) for the former 1/2 A period (26.25 ⁇ s) of a pulse and the data signal is written in the liquid crystal layer for the remaining 37.25 ⁇ s period.
- the write period for the liquid crystal layer ranges from 63.5 ⁇ s to 37.25 ⁇ s. According to the present invention, therefore, the shortest write period is 37.25 ⁇ s, compared to 11 ⁇ s in the conventional drive system. Consequently, compared with the conventional drive system, the present invention can permit a longer period for writing data signals in the liquid crystal layer and effect a smaller difference between the minimum and maximum write periods, so that the liquid crystal layer is charged to a higher potential and the difference in the write period among the picture elements in the lateral direction of the display panel is minimized.
- FIGS. 7 and 8 show another example of switching transistor gate signals applied to the row electrodes e 1 , e 2 , . . . , and e m .
- the gate signals turn ON the switching transistors synchronously with a display picture element whose write period is the shortest.
- the gate signals have a pulse width of a 37.25 ⁇ s period or about 1/2 the horizontal scanning period 1H (63.5 ⁇ s).
- the gate signals for an odd number row electrode 1a is synchronized with the center of a low level period of the horizontal synchronization signal, whereas the gate signal for an even number row electrode 1b is synchronized with a rising edge of the horizontal synchronization signal.
Abstract
Description
Claims (3)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60-52807 | 1985-03-15 | ||
JP60052807A JPH0766249B2 (en) | 1985-03-15 | 1985-03-15 | Driving method for liquid crystal display device |
Publications (1)
Publication Number | Publication Date |
---|---|
US4830466A true US4830466A (en) | 1989-05-16 |
Family
ID=12925113
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/839,196 Expired - Lifetime US4830466A (en) | 1985-03-15 | 1986-03-13 | Drive system for an active matrix liquid crystal display panel having divided row electrodes |
Country Status (4)
Country | Link |
---|---|
US (1) | US4830466A (en) |
JP (1) | JPH0766249B2 (en) |
DE (1) | DE3608419A1 (en) |
GB (1) | GB2173628B (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4982183A (en) * | 1988-03-10 | 1991-01-01 | Planar Systems, Inc. | Alternate polarity symmetric drive for scanning electrodes in a split-screen AC TFEL display device |
US5206748A (en) * | 1990-03-27 | 1993-04-27 | Semiconductor Energy Laboratory Co., Ltd. | Wide-frame electro-optic device |
US5260698A (en) * | 1986-08-13 | 1993-11-09 | Kabushiki Kaisha Toshiba | Integrated circuit for liquid crystal display |
US5648793A (en) * | 1992-01-08 | 1997-07-15 | Industrial Technology Research Institute | Driving system for active matrix liquid crystal display |
US5781168A (en) * | 1993-11-15 | 1998-07-14 | Nippondenso Co., Ltd. | Apparatus and method for driving an electroluminescent device |
US5963186A (en) * | 1990-08-07 | 1999-10-05 | The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland | Multiplex addressing of ferro-electric liquid crystal displays |
US6246385B1 (en) * | 1997-04-28 | 2001-06-12 | Matsushita Electric Industrial Co., Ltd. | Liquid crystal display device and its driving method |
EP1170720A2 (en) * | 2000-07-07 | 2002-01-09 | Sony Corporation | Display apparatus and driving method therefor |
US6437767B1 (en) | 1997-04-04 | 2002-08-20 | Sharp Kabushiki Kaisha | Active matrix devices |
US6885366B1 (en) * | 1999-09-30 | 2005-04-26 | Semiconductor Energy Laboratory Co., Ltd. | Display device |
US20060061535A1 (en) * | 2004-09-23 | 2006-03-23 | Lg Philips Lcd Co., Ltd. | Liquid crystal display device and method of driving the same |
US20060114196A1 (en) * | 2004-12-01 | 2006-06-01 | Samsung Sdi Co., Ltd. | Organic electroluminescence display and method of operating the same |
US20090251403A1 (en) * | 2008-04-07 | 2009-10-08 | Himax Technologies Limited | Liquid crystal display panel |
US20110148954A1 (en) * | 2009-12-21 | 2011-06-23 | Mitsubishi Electric Corporation | Image display apparatus |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0685108B2 (en) * | 1985-08-29 | 1994-10-26 | キヤノン株式会社 | Matrix display panel |
JPH0364735A (en) * | 1989-08-03 | 1991-03-20 | Sharp Corp | Active matrix display device |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4281324A (en) * | 1977-10-31 | 1981-07-28 | Sharp Kabushiki Kaisha | Matrix type liquid crystal display |
US4356483A (en) * | 1977-02-14 | 1982-10-26 | Citizen Watch Company, Limited | Matrix drive system for liquid crystal display |
DE3220958A1 (en) * | 1981-06-04 | 1982-12-23 | Sony Corp., Tokyo | LIQUID CRYSTAL MATRIX DISPLAY ARRANGEMENT |
GB2138615A (en) * | 1983-03-16 | 1984-10-24 | Citizen Watch Co Ltd | Matrix display systems |
GB2139795A (en) * | 1982-12-28 | 1984-11-14 | Citizen Watch Co Ltd | Method of driving liquid crystal matrix display |
JPS59210415A (en) * | 1983-05-13 | 1984-11-29 | Seiko Epson Corp | Large-sized liquid-crystal display device |
JPS6039618A (en) * | 1983-08-12 | 1985-03-01 | Hitachi Ltd | Driving system of liquid crystal display element |
GB2159656A (en) * | 1984-06-01 | 1985-12-04 | Sharp Kk | Liquid crystal display arrangements |
US4651148A (en) * | 1983-09-08 | 1987-03-17 | Sharp Kabushiki Kaisha | Liquid crystal display driving with switching transistors |
US4724433A (en) * | 1984-11-13 | 1988-02-09 | Canon Kabushiki Kaisha | Matrix-type display panel and driving method therefor |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5927687A (en) * | 1982-08-04 | 1984-02-14 | Casio Comput Co Ltd | Pocketable television receiver |
JPS59111622A (en) * | 1982-12-17 | 1984-06-27 | Seiko Epson Corp | Liquid-crystal display type picture receiver |
JPS59176985A (en) * | 1983-03-26 | 1984-10-06 | Citizen Watch Co Ltd | Liquid crystal television receiver |
-
1985
- 1985-03-15 JP JP60052807A patent/JPH0766249B2/en not_active Expired - Fee Related
-
1986
- 1986-03-13 DE DE19863608419 patent/DE3608419A1/en active Granted
- 1986-03-13 US US06/839,196 patent/US4830466A/en not_active Expired - Lifetime
- 1986-03-17 GB GB08606485A patent/GB2173628B/en not_active Expired
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4356483A (en) * | 1977-02-14 | 1982-10-26 | Citizen Watch Company, Limited | Matrix drive system for liquid crystal display |
US4281324A (en) * | 1977-10-31 | 1981-07-28 | Sharp Kabushiki Kaisha | Matrix type liquid crystal display |
DE3220958A1 (en) * | 1981-06-04 | 1982-12-23 | Sony Corp., Tokyo | LIQUID CRYSTAL MATRIX DISPLAY ARRANGEMENT |
GB2139795A (en) * | 1982-12-28 | 1984-11-14 | Citizen Watch Co Ltd | Method of driving liquid crystal matrix display |
GB2138615A (en) * | 1983-03-16 | 1984-10-24 | Citizen Watch Co Ltd | Matrix display systems |
JPS59210415A (en) * | 1983-05-13 | 1984-11-29 | Seiko Epson Corp | Large-sized liquid-crystal display device |
JPS6039618A (en) * | 1983-08-12 | 1985-03-01 | Hitachi Ltd | Driving system of liquid crystal display element |
US4651148A (en) * | 1983-09-08 | 1987-03-17 | Sharp Kabushiki Kaisha | Liquid crystal display driving with switching transistors |
GB2159656A (en) * | 1984-06-01 | 1985-12-04 | Sharp Kk | Liquid crystal display arrangements |
US4724433A (en) * | 1984-11-13 | 1988-02-09 | Canon Kabushiki Kaisha | Matrix-type display panel and driving method therefor |
Non-Patent Citations (2)
Title |
---|
Advances in Image Pickup and Displays, vol. 4, Academic Press 1981, pp. 61 63. * |
Advances in Image Pickup and Displays, vol. 4, Academic Press 1981, pp. 61-63. |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5260698A (en) * | 1986-08-13 | 1993-11-09 | Kabushiki Kaisha Toshiba | Integrated circuit for liquid crystal display |
US4982183A (en) * | 1988-03-10 | 1991-01-01 | Planar Systems, Inc. | Alternate polarity symmetric drive for scanning electrodes in a split-screen AC TFEL display device |
US5206748A (en) * | 1990-03-27 | 1993-04-27 | Semiconductor Energy Laboratory Co., Ltd. | Wide-frame electro-optic device |
US5963186A (en) * | 1990-08-07 | 1999-10-05 | The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland | Multiplex addressing of ferro-electric liquid crystal displays |
US5648793A (en) * | 1992-01-08 | 1997-07-15 | Industrial Technology Research Institute | Driving system for active matrix liquid crystal display |
US5781168A (en) * | 1993-11-15 | 1998-07-14 | Nippondenso Co., Ltd. | Apparatus and method for driving an electroluminescent device |
US6437767B1 (en) | 1997-04-04 | 2002-08-20 | Sharp Kabushiki Kaisha | Active matrix devices |
US6246385B1 (en) * | 1997-04-28 | 2001-06-12 | Matsushita Electric Industrial Co., Ltd. | Liquid crystal display device and its driving method |
US6885366B1 (en) * | 1999-09-30 | 2005-04-26 | Semiconductor Energy Laboratory Co., Ltd. | Display device |
US20050156920A1 (en) * | 1999-09-30 | 2005-07-21 | Semiconductor Energy Laboratory Co., Ltd. | Display device |
US7106316B2 (en) | 1999-09-30 | 2006-09-12 | Semiconductor Energy Laboratory Co., Ltd. | Display device |
EP1170720A3 (en) * | 2000-07-07 | 2003-03-12 | Sony Corporation | Display apparatus and driving method therefor |
EP1170720A2 (en) * | 2000-07-07 | 2002-01-09 | Sony Corporation | Display apparatus and driving method therefor |
US20060061535A1 (en) * | 2004-09-23 | 2006-03-23 | Lg Philips Lcd Co., Ltd. | Liquid crystal display device and method of driving the same |
US7839374B2 (en) * | 2004-09-23 | 2010-11-23 | Lg. Display Co., Ltd. | Liquid crystal display device and method of driving the same |
US20060114196A1 (en) * | 2004-12-01 | 2006-06-01 | Samsung Sdi Co., Ltd. | Organic electroluminescence display and method of operating the same |
US7868865B2 (en) * | 2004-12-01 | 2011-01-11 | Samsung Mobile Display Co., Ltd. | Organic electroluminescence display and method of operating the same |
US20090251403A1 (en) * | 2008-04-07 | 2009-10-08 | Himax Technologies Limited | Liquid crystal display panel |
US20110148954A1 (en) * | 2009-12-21 | 2011-06-23 | Mitsubishi Electric Corporation | Image display apparatus |
US9147370B2 (en) * | 2009-12-21 | 2015-09-29 | Mitsubishi Electric Corporation | Image display apparatus |
Also Published As
Publication number | Publication date |
---|---|
JPS61210398A (en) | 1986-09-18 |
GB8606485D0 (en) | 1986-04-23 |
DE3608419C2 (en) | 1988-08-25 |
GB2173628B (en) | 1988-07-27 |
GB2173628A (en) | 1986-10-15 |
JPH0766249B2 (en) | 1995-07-19 |
DE3608419A1 (en) | 1986-09-25 |
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